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-rw-r--r--compiler/utils/UniqFM.lhs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/utils/UniqFM.lhs b/compiler/utils/UniqFM.lhs
index 59158f38b2..de02227031 100644
--- a/compiler/utils/UniqFM.lhs
+++ b/compiler/utils/UniqFM.lhs
@@ -698,7 +698,7 @@ insert_ele f (LeafUFM j old) i new
(indexToRoot j))
(mkLeafUFM i new)
(mkLeafUFM j old)
- | j ==# i = mkLeafUFM j (f old new)
+ | j ==# i = mkLeafUFM j $! f old new
| otherwise =
mkLLNodeUFM (getCommonNodeUFMData
(indexToRoot i)